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SubjectRe: [PATCH 15/32] union-mount: Documentation
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Arnd Bergmann:
> Right, but that is consistent with how the kernel would treat a
> rename from one mount point to another, and tools like 'mv'
> can handle this in user space.

Yes, that is the description in the union mount document.
While it says to rename a regular file is implemented, the code differs
actually.
----------------------------------------
+Rename across different levels of the union is implemented as a copy-up
+operation for regular files. Rename of directories simply returns EXDEV, the
+same as if we tried to rename across different mounts. Most applications have
:::
----------------------------------------

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